#include <stdio.h>
#include "fileutil.h"

int fgetc(FILE *fp)
{
	if(!fp->readable) {
		fp->error = 1;
		return EOF;
	}

	/* For this function we inline __fp_fread2() and__fp_buffered_read() in
	   order to maintain decent performance */
	unsigned char c;
	__fp_buffer_mode_read(fp);

	/* No buffered data available, non-buffered mode */
	if(!fp->buf) {
		ssize_t rc = __fp_read(fp, &c, 1);
		return (rc == 1) ? c : EOF;
	}

	/* If there is no data, get some */
	if(fp->bufpos >= fp->bufread) {
		ssize_t rc = __fp_read(fp, fp->buf, fp->bufsize);
		if(rc <= 0)
			return EOF;
		fp->bufread = rc;
	}

	/* Get a byte from the buffer */
	c = fp->buf[fp->bufpos++];
	fp->bufungetc -= (fp->bufungetc > 0);

	/* Rewind the buffer if at end, and clear _IONBF ungetc() buffers */
	if(fp->bufpos >= fp->bufread) {
		fp->bufread = 0;
		fp->bufpos = 0;
		if(fp->bufmode == _IONBF)
			__fp_remove_buffer(fp);
	}

	return c;
}